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Dimethyl Sulphoxide - Hubei Xingfa, China
Dimethyl sulfoxide (DMSO) is a clear hygroscopic liquid; melting point 18 C; boiling point 189 C. It is has little odor. It smells garlic like odor due to the impurity of dimethyl sulfide. It is miscible with water; readily soluble in almost all organic solvents such as alcohols, esters, ketones, chlorinated solvents and aromatic hydrocarbons. Dimethyl sulfoxide is produced as a by-product of wood pulping.
DMSO is a highly dipolar organic liquid, that is used as a powerful solvent in organic synthesis and industrial applications including paint stripper and coating remover as the alternative to chlorinated solvents and nitroalkanes. DMSO's high polarity solvates polymeric materials by itself or in combination with other solvents. Its application is extended as a chemical reactant undergoing a chemical change. DMSO proved to be an excellent reaction solvent for S
N2 alkylation.
DMSO is used in oxidation reactions which a primary or secondary alcohol is oxidized to the corresponding aldehyde or ketone (Swern oxidation). Sulfoxonium ion reacts with sodium hydride to form sulfur ylide which converts carbonyl to epoxide (Johnson-Corey-Chaykovsky reaction). It is widely used in the synthesis of pharmaceuticals, biocides and pesticides insecticides as a reactant, reaction solvent, in combinations of these applications. Some examples are diphenyl ether compounds, imidazolinone compounds, and pyrethroids.
The catalysts in hydrocracking, hydrodenitrification, hydrodesulfurization and reforming processes are used in oxide forms, which must be converted to the active sulfide form during the start-up to prevent the reduction of the catalysts to their base material by heat. The sulfur sources include alkyl mercaptans (methyl mercaptan, ethyl mercaptan, butyl mercaptan), dimethyl sulfide, dimethyl sulfoxide, dimethyl disulfide, and tert-nolyl polysulfide.
Physical and Chemical Properties: |
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Physical state and appearance | Liquid | Odor | Amine like. (Slight.) | Molecular Weight | 73.09 g/mole | Color | Colorless to light yellow | Boiling Point | 153°C (307.4°F) | Flash point | 58 ° | Melting Point | -61°C (-77.8°F) | Specific Gravity | 0.949 (Water = 1) | Vapor Pressure | 0.3 kPa (@ 20°C) | Vapor Density | 2.51 (Air = 1) | Odor Threshold | 100 ppm | Solubility | Easily soluble in cold water, hot water. Soluble in diethyl ether, acetone. Miscible organic solvents. Soluble in benzene, and chloroform. | Content by dmso % | ≥ 99.80 | Freezing point °c | ≥ 18.10 | Acid value mgkoh/g | ≤ 0.03 | Water % | ≤ 0.10 | Transmittance (400n m) % | ≥ 96.00 | Pefractive index 20 °c | 1.4780-1.4790 | Total impurities % | ≤ 0.1 | pt-co chrominance | ≤ 10 |
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